Anger management!

Play until you get used to it.

Zen

Trying to understand what went wrong and improving. Also stop thinking it's your team's fault and/or other team's luck.

If you're right handed, install mattress vertically on your left (it would be great if it would be next to a wall). Punch when needed.

Take deep breaths, get up and take a short walk around the house/apartment/whatever. Drink a glass of water and come back. If there are any trees outside, sit somewhere look at them for a while.

Don't play shitty games

If playing a game doesn't please you..... STOP, DROP, AND TROLL!

Put a pillow over your face & let out that anger, or, if you want to get friendly with your neighbors, then forget the pillow...

Just stop caring about it.